# The Historical past of Mathematical Symbols

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## Transcript

One of many easiest mathematical statements attainable is 2+2=4.

Whereas the idea could be very straightforward to know, if you write it down it’s important to use mathematical symbols that are, traditionally talking, a comparatively current invention.

At one level, mathematicians have been doing fairly sophisticated work with out the advantage of symbols in any respect. One thing which is unthinkable as we speak.

Be taught extra about mathematical symbols, the place they got here from, and why they exist, on this episode of Every little thing In every single place Each day.

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As I discussed within the intro, there was a time when mathematic was accomplished with out symbols. Should you can think about doing all of your elementary college math issues with out using plus, minus, or equal symbols, you possibly can notice how arduous this is able to be.

In actual fact, it could be actually tough to do proper now with out using symbols.

The primary folks we all know of who used arithmetic have been the traditional Babylonians and Sumerians. With their cuniform system of writing, they have been capable of do fairly sophisticated arithmetic.

Their numeral system was base-60, versus ours which is base-10. The idea holds that two earlier folks merged to grow to be the Sumerians and one group had a system that was base-12 and the opposite had a system that was base-5. They resolved the distinction through the use of 60, which was simply 5 x 12.

They have been capable of clear up quadratic equations, knew about sq. and dice roots, and had solved the Pythagorean theorem nicely earlier than Pythagoras.

Nevertheless, they lacked a couple of issues. They didn’t have a zero, which is one thing I talked about in my episode about zero, and didn’t actually have any symbolic expressions to do equations.

It wouldn’t seem like algebra as we’re aware of it.

The Egyptians, Greeks, Romans, and Arabs all managed to do arithmetic at some degree with out using mathematical symbols.

Algebra was truly named by Arab students and it actually comes from *“al-jabr” *which implies a reunion of damaged components.

Arab students in all probability took arithmetic so far as anybody in historical past up till that point, however they nonetheless principally weren’t utilizing symbolic notation.

The final nice traditional Arab mathematician from the early fifteenth century Ab? al-Hasan ibn Al? al-Qalas?d?, used symbols, however they have been simply letters from the Arabic alphabet.

The symbols we all know and use as we speak weren’t created till the fifteenth century.

The primary use of the plus signal was in 1489 by German mathematician Johannes Widmann.

The plus signal simply represents the letter “t” which was a brief type of the Latin phrase *“et”* which implies *“and”.*

Likewise, Widmann was the primary particular person to make use of the minus signal as nicely. The minus signal is believed to return from a tilde which was typically positioned over a quantity to signify subtraction.

In his treatise, he explicitly outlined the brand new phrases which he created. He mentioned *“was ? ist, das ist minus, und das + ist das mer”. * Mer being German for extra.

There have been different earlier makes an attempt to create symbols that did the identical factor, however they didn’t catch on. The Egyptians had a logo that could possibly be used for addition and the mirror picture of it could possibly be used for subtraction, however it by no means went past Egypt.

Not lengthy after, within the early seventeenth century, the multiplication image was created. That is after all simply the letter “x”.

The primary use of “x” to indicate multiplication was in 1618 by Scottish mathematician John Napier in his ebook *Mirifici Logarithmorum Canonis Descriptio.*

He too defined using this new image within the ebook by saying, *“Multiplication of species [i.e. unknowns] connects each proposed magnitudes with the image ‘in’ or ×: or ordinarily with out the image if the magnitudes be denoted with one letter.”*

Technically, in printing, the multiplication image isn’t truly the letter x. It’s a barely smaller character of the identical form which is raised up.

There will be confusion when utilizing a daily keyboard with “x” as a multiplication image and utilizing “x” as a variable. Gottfried Leibniz, one of many co-inventors of calculus, disliked utilizing an “x” because of this.

For that motive, a dot can also be typically used as a multiplication image. That is often extra in style in Europe, and it too will be complicated as a result of a dot is used for a particular sort of vector multiplication.

With the arrival of computer systems, the asterisk * has been adopted for multiplication just because it’s within the ASCII character set.

Simply as with multiplication, there are a number of symbols for division as nicely.

The earliest of the trendy division symbols which we use is named the obelus. That is the straight line with a dot above and beneath it.

This was first utilized in 1659 by Swiss mathematician Johann Rahn.

Of all the symbols I’ve talked about, this one has been deprecated by trendy mathematicians. In actual fact, you possibly can’t actually discover in use very a lot in any respect exterior of elementary college math programs and the division keys on some calculators.

Personally, I hate the obelus. I discovered it actually complicated and I don’t suppose youngsters needs to be taught division utilizing it as a result of they’ll by no means see it once more of their lives.

The popular division image is named the solidus or the ahead slash. That is similar to, and conveys the identical that means, because the horizontal line utilized in fractions. This was a a lot later creation and wasn’t to signify division till 1845.

The adoption of computer systems solely strengthened using the solidus over the obelus because the obelus isn’t on most keyboards.

The equal image has a really fascinating origin story.

The equal image was first utilized in 1557 by Welsh mathematician Robert Recorde in his ebook *The Whetstone of Witte*.

In his ebook, he was writing equations, and over 200 occasions he needed to write the phrase “is the same as”. He principally received sick of writing it again and again, so he finally created a logo so he didn’t have to jot down it anymore.

He mentioned in his ebook,* “And to keep away from the tedious repetition of those phrases: “is the same as” I’ll set as I do typically in work use, a pair of parallels, or duplicate traces of 1 [the same] size, thus: =, as a result of no 2 issues will be extra equal.”*

There’s a related, lesser-used image, with three parallel traces merely known as the triple bar. It was first utilized in 1801 by Carl Friedrich Gauss and it’s typically utilized in logic, or in modular arithmetic.

The % signal comes from the Italian phrase per cento. It was abbreviated as a “p” with two zeros, and finally, the “p” was eliminated and it was only a slanted line with two zeros.

The sq. root image might need come from an Arabic letter that was utilized by the above-mentioned al-Qalas?d?, or probably from a decrease case letter “r”.

The primary use in 1525 simply regarded like a checkmark. The horizontal line on high is named a vinculum, and it was added to the checkmark image in 1637 by Rene Descartes to create the trendy image we use as we speak.

The larger than and fewer than symbols have been created in 1631 by Englishman Thomas Harriot in his ebook *The Analytical Arts Utilized to Fixing Algebraic Equations.*

The infinity image, that being the quantity 8 on its facet, is even older than the trendy quantity 8, which is a Hindu-Arabic quantity. The earliest proof for it goes again to the cross of St. Boniface within the seventh or eighth century.

The primary use of it to suggest infinity wasn’t till 1655. English clergyman John Wallis used it in his ebook *De sectionibus conicis.* There was no rationalization given as to why it was chosen, however one speculation is that it’s a variant of the image used for the Roman Quantity 1000, which was the letter C, adopted by an I, after which with a backward C.

The final image I’ll go over is that of pi.

Pi after all is simply the greek letter pi. Nevertheless, its use to signify the ratio of the circumference of a circle to its diameter is definitely comparatively current.

The information that the ratio of the circumference to the diameter of a circle was particular goes again to historical China and Egypt.

What we consult with because the quantity pi started using the Greek letter delta and pi. Pi was chosen as a result of it was the primary letter of the phrase “perimeter”, and delta was the primary letter of “diameter”. Englishman William Oughtred first used pi over delta in 1647.

The primary use of the letter pi all by itself to signify the ratio was in 1706 by the Welsh mathematician William Jones.

There’s a lot to be mentioned about pi, however I’ll save that for a later episode, in all probability for subsequent yr’s Pi day.

You might need observed that almost all of those symbols, particularly the principle ones, all started getting used over the course of a 100 years, beginning within the late fifteenth century. Principally, as soon as folks began to make use of symbols, it made arithmetic simpler, after which extra folks started to undertake them as a shorthand for extra issues.

Mathematical symbols are nonetheless being created as we speak as new branches of arithmetic create new concepts which must be simply expressed.

If you concentrate on it, math symbols actually aren’t that a lot completely different than emojis. It’s only a method to convey a posh thought right into a single character.

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